add new component types to test utils

[kim-tsao]

What does this PR do?

Adds the kubernetes and openshift component types to the test utils for improved coverage. Corresponding changes in library repo will be added once this PR has been approved and merged.

What issues does this PR fix or reference?

#495

Is your PR tested? Consider putting some instruction how to test your changes

Yes, I manually ran the go test -v commands locally against the api and library repos to ensure there were no regressions

Docs PR

N/A

[openshift-ci]

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This pull-request has been approved by: amisevsk, kim-tsao

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[yangcao77]

I'm thinking perhaps we don't need to split those component creation into sub function calls.
Those function call are almost identical, except for the part of creating an empty component.
can combine those sub function calls within this AddComponent

Suggested change

	component = devfile.createKubernetesComponent()
	func (devfile *TestDevfile) AddComponent(componentType schema.ComponentType) schema.Component {
	LogInfoMessage("Create a %v component :", componentType)
	component := schema.Component{}
	component.Name = GetRandomUniqueString(8, true)
	LogInfoMessage(fmt.Sprintf("....... Name: %s", component.Name))
	switch componentType{
	case schema.ContainerComponentType:
	component.Container = &schema.ContainerComponent{}
	devfile.SetContainerComponentValues(&component)
	...... // cases for other component types
	}
	devfile.componentAdded(component)
	return component
	}

Same for AddCommand

[yangcao77]

@kim-tsao I guess I'm late for this PR..

[kim-tsao]

@yangcao77 sorry I missed this! I appreciate your feedback anyhow so I'll try to apply your suggestion next time, thanks.